Automatic high-voltage circuit-breaker.



Patented Jan. 14, 1913.

APPLICATION FILED MAR.18,1910.

E. 0. SOHWEITZER &'N. J. CONRAD.

AUTOMATIC HIGH VOLTAGE CIRCUIT BREAKER.

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UNITED STATES PATENT ()FFICE.

EDMUND O. SCI-IWEITZER- AND NICHOLAS J. CONRAD, OF CHICAGO, ILLINOIS.

AUTOMATIC HIGH-VOLTAGE CIRCUIT-BREAKER.

Specification of Letters Patent.

Patented Jan. 14, 1913.

Application filed March 18, 1910. Serial No. 550,219.

To all whom it may concern:

Be it known that we, EDMUND O. SoHwEITzER and NICHOLAS J. CONRAD,citizens of the United States, residing at Chi cago, in the county ofCook and State of Illinois, have invented a certain new-and usefulImprovement in Automatic High Voltage Circuit-Breakers, of which thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of thisspecification.

Our invention relates to automatic high voltage circuit breakers and hasfor its objectthe provision of an improved circuit breaker which shall,when it is desired to rupture the circuit, actually open it withoutcausing or allowing to flow a large amount of current at the same timeof said rupture.

In high voltage circuit breaking, the difficulty has frequently beenpresented in that,

when the fusible element opens, a gas is formed which permits a largeflow of current provided, of course, the system has a considerablegenerating capacity.

In the preferred form of our invention we actually open the circuit andat the same time under certain conditions, open this circuit in an oilbath, although our invention is not limited absolutely to such opening.In the preferred form of the invention, furthermore, we use a spiralcoil of wire whose convolutions do not touch, but which is so arrangedthat when a large amount of current flows through said convolutions thatthe magnetic pull between said convolutions tends to contract thesaidspiral element, thereby .to open the circuit in any of a pluralityof suitable ways.

We will describe our invention more in detail by reference to theaccompanying drawing illustrating several embodiments thereof, in which;

' Figure 1 is a sectional view of our improved circuit controllingdevlce; and Fig. 2

Referring more particularly to Fig. 1, we show a cylinder ofglass orother suitable insulating material '1, which has two end caps 2 and 3.The end cap 2 has a spiral spring 4 soldered to it or otherwise securedthereto at 5, and this spiral spring has a openings 9. Said member 6 isdesigned to project into a spring clip 10 attached to the lower cup 3. Asuitable bath of oil 11 may be provided. The partition 8 allows the oilto escape slowly from the fuse chamber upon rupture of the fuse, rapidlyenough to prevent breakage of the tube, but slowly enough to retainenough oil to extinguish the arc. When the current passing through thedevice unduly increases in volume the pull exerted by the coiled member4 is increased on account of the magnetic pull bet-ween its convolutionsand serves to exert a pull upon the member 6, withdrawing it from thespring clip 10 and breaking the circuit, in this instance under oil asshown. The high voltage of the circuit thus will have no in-- juriouseffect when the circuit is broken.

In the modification shown in Fig. 2, the fusible element 12 is providedin a lower chamber of the tube 1 and only one spiral element is used. Weprovide, however, a guide 13, which may hold the convolutions in theirproper posit-ions, which guide, of course, should be of insulatingmaterial.

Again the rupture may take'place under oil as shown at 11. We thus makeuse of the principle that convolutions of a coil carrying a current tendto attract each other.

The partition 8 is preferably so made that modifications thereof may beeasily made and yet be within the scope of our invention and What wetherefore claim as new and desire to secure by Letters Patent is:

A device of the class specified, comprising a tubular casing made ofinsulating materiaLterminals at the ends of said tubular casing, a fuseand a cooperating spiral spring in said tubular casing and connected ournames'this 15th day of March A. D.,

to the terminals at the ends thereof, and a 1910.

bath of arc extinguishing liquid in said 0215- EDMUND ER in normallyimmersing said fuse the casing Y 1 being provided with a partition, forretard- BICHOLAS COLRAD ing the'fiow of liquid from the space 00-\Vitnesses:

cupied by the fuse; HAZEL J ONES,

In Witness whereof, we hereunto subscribe A. LYDA JONES.

